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#!/bin/bash
ip link set lo up
$NFT -f - <<EOF
table inet filter {
chain underflow { }
chain input {
type filter hook input priority filter; policy accept;
icmp type echo-reply accept
ip saddr 127.0.0.1 ip daddr 127.0.0.2 counter accept
goto underflow
}
}
EOF
[ $? -ne 0 ] && exit 1
ping -q -c 1 127.0.0.2 >/dev/null || exit 2
# should work, polict is accept.
ping -q -c 1 127.0.0.1 >/dev/null || exit 1
$NFT -f - <<EOF
table inet filter {
chain input {
type filter hook input priority filter; policy drop;
}
}
EOF
[ $? -ne 0 ] && exit 1
$NFT list ruleset
ping -W 1 -q -c 1 127.0.0.2
ping -q -c 1 127.0.0.2 >/dev/null || exit 2
# should fail, policy is set to drop
ping -W 1 -q -c 1 127.0.0.1 >/dev/null 2>&1 && exit 1
exit 0
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